What is a foreign key? - Definition from TechTarget
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mysql - How to add an auto incremented primary key as a foreign key to existing database tables? - Stack Overflow
SQL FOREIGN KEY - w3resource
SQL FOREIGN KEY: How to Create in SQL Server with Example
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How to Create a Table With Multiple Foreign Keys in SQL? - GeeksforGeeks
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An Essential Guide to MySQL Foreign Key By Practical Examples
SQL FOREIGN KEY (With Examples)
Primary and Foreign Key in SQL with Example | Besant Technologies
Hibernate One-To-One Unidirectional with Foreign Key Associations (Annotation) - WebSystique
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What is a Foreign Key? (With SQL Examples)
Foreign Key Relationship - an overview | ScienceDirect Topics
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